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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526c441eba7199b375ad75f51e6834edb9d6e456873d8974d472c083bb1b4295' 
  AND token = 'fhonZODHcaD0aDa8U5dBU6cqdNl3xUBKo5Mk7JA6BMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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