SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96aa06f926270f2b411695b9ef05345475fa047b4a04f8ee3532823789fc0ee4' 
  AND token = 'YXgXLsUoBfLzJHW4Ebndq5gW7B16B+8umPJIVjZQr6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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