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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b06c29f00997b81f5335e79b703e7340a7e7e1bcf4f77701b0fe7dff5f2018' 
  AND token = 'XcWG2GkhlnqCGiE2RVgRN34o6ZaObKAwY7CNXV5aztY=' 
  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