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Is is OK to drive the gate voltage of an n-channel MOSFET higher than the drain voltage?

The scenario is turning on a circuit with a sensor that outputs higher voltage than the circuit runs on. Specifically, a 5V sensor and a 3.0V circuit.

The MOSFET I have available is a 2n7000.

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Not only is it OK, it's a normal mode of operation for every MOSFET in a switching application.

MOSFETs are typically selected precisely because the drain voltage can be made very low when switched on, usually lower than a BJT. If the drain voltage were higher, and any significant current were being switched, then the MOSFET would get very hot, since power is the product of current and voltage: \$P=IV\$.

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