SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40364df15cc02570ecb2f7f0b0880f34551eae83462def3067bc9b8811301e71' 
  AND token = 'QyzrRgWvxrylX6jZDC6Fa6QELTgewzV+N9UhlRHh5J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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