Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc91281574bfa5dfe746bde99cff0e44f31d38ffb5e2c879e6ab6474300ea4b' 
  AND token = '5c5oxLhXYbchfCbgtwxATaBuuycWn+OQFWYfoq90ock=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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