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If you have another ignition key try it. If you have the key fob/remote you can next try to lock and unlock the vehicle and then start. This system cannot be disabled. The anti theft works with the PCM and if the right signal is not received it will not enable to start. It would be best to check for codes if a scanner is available. Most parts stores scan for free but they only use minimum function scanners. If the anti theft light is flashing there is a system fault, it should go on with the key on and then go off after a few seconds.
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key has a transponder, if it does not send a signal or the receiver does not get one or send one to the pcm the vehicle will not start.
dealership IDS scanner gives the tech a big advantage