SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7012b6a26b1dac6e7ff4f87f799289ac92cce4393d049c6dc050845658997995' 
  AND token = 'Gg0PCcn9h/l1k4UxvMD7fW/tVFnsqKKUbszYyRa+Hfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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