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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4731625c9e5a6b84616a691d6c026a57b9d2bfded8ae9fca64a32bcbbb35a418' 
  AND token = 'Yf9T3Rih1tjKzMhOXGzVt8BCwct5yEDf9HYocl6N6pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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