Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd4f53d32712ed183c080c2f970848ad17ed3768299106dd50b4a379af7b8cd' 
  AND token = 'uNTdEUpHRusozLe8pPMi2HUeatWp/nNUaVrJBtc9WQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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