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The pipes are not run in the concrete, they are in the subsoil beneath the concrete.
Normal water usage at a kitchen sink is both intermittent and low volume therefore under normal circumstances it is totally unlikely that the hot water line would radiate enough heat energy to affect the floor temperature. On the other hand, if there happened to be a leak in a hot water line under the floor the flow of water would be constant and could cause a temperature increase such as you describe.
If you are on a municipal water supply there is an easy test to see if you have a water leak. First turn off all faucets in the house and make sure that all toilet tanks are full. You then check the flow indicator on the water meter to see if there is any flow. If the flow indicator is showing a flow when all normal water demands are off the obvious conclusion is that you have a leak. Next, turn the water heater cold water supply valve off and see if that stops the flow. Once again check the water meter to see if turning the water heater supply off stopped the flow. If so, it is almost a certainty that there is a leak in the line under the floor.
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