SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3ddeaab7146d6ff2b2b39cac8b9f26bff922db69eff95be76249520b4dbe11' 
  AND token = 'xEjzQ0lSOnt5PjwC6hDW1LgB9SZzLCVt/K8ivFiZaLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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