SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f4511e20916d5d6639a3a21e5f926a2a35b257448a4a3de4db621a4b34c063' 
  AND token = '7cWgQZKIJFJhqHXabvwpMaSgn8BvQRtacWbt8XXjXgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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