Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9a9eaa5398dcd34aabb9ed4c2d8936be83f93f06da47186187a4cac987bbce' 
  AND token = 'mT/ItuNOf9euiG8YPVK4+AKd4kzdldOTAbR1qVVZ9do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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