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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2f76942bcb75494b46a4d6db0cb328c8ba9a6c4857d7d7c172f70edd498bb5' 
  AND token = 'KVbaap38RD9tLqWP7y732XgKfzI8kMMSQkwve5ByJoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables