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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4931598b8c2d8a142691a0e0ad9ed1fb5906ca772dc577e8a70db635604ba5e' 
  AND token = '0YKEC3WLCPa0fhzhWpiK3x2qRZBtivzphG8tDzjdO9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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