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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2491e5cd1412b01068f069c872898df568f3405bee9e81f2b3b7fee0f2de4b' 
  AND token = 'kUvqnBLaZRusc33U0TmusneYnZNuhgJ8NY7kRJr7E5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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