SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d830697e3d0166eeceaf287ed952d04c9cc5c48f6a8a7a3709853f9facb51b' 
  AND token = 'aa8hVhlIoYxy35CxWwLfTjJtXUdLAuY/lNciX2FwgBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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