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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a133ebffa8e395f90c77d9bb9339202b92751852c6d0bd9665e5ba81f336f3df' 
  AND token = '4HqNB1tFutJ5yajPANl3wEVsq0Q8Zy0j4dMGXYkkPlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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