SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912f30152638864c6b0bd7b15774a2188b3060cec33b1653a9db47d86a829654' 
  AND token = 'LG7jjqB5YqOrJQrP/Ccetf4LsPKoKoz001iZQ7x+QvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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