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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604b85ddcf18a5a8e6cf014f7ea5c25b5d522b6e8887bd671710e4e53b8ce801' 
  AND token = 'mQQZ1JGXjizQGPX7VCMRCVZOVIwFQrGOh4P4E+CA1Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}