Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58ca49564a21041105f5d36f911240e945bd29f99b8b809eb9607cd71e064cf' 
  AND token = 'l+9lLSeNXmhU3PuM5vXAiHr3pGn0g0OJ3zMLg/dMdbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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