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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac6e796218c122cdf49c6032919f508e96d5715f8cfbbafadc149419660a7e9' 
  AND token = 'uUOFVzOAMQCmroqqQdv4eDC2fPkxhCnkCVo2a94kYm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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