SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf13965913befac52bc5940cac3025a19346770bbd638e95e03d6f217fd1cc86' 
  AND token = 'gzap3NlLtqzHhBcW4f//CHueYvhchxCDoEuunXJUFw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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