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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c9280334ba34005540c80d07a78feab98714dd7e4d4750981f3afff97bbd2d' 
  AND token = 'm/fWHX4J/6dSvn2XdKZApo4Sue6PxuMsIpIYeck6vu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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