SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b094c8c84228a1f24e63796cdaa07967f801a1407bd3913519ce43cb452fd9' 
  AND token = 'ZuiK1ckqFIH++pNkSE81jv81lKL//sEiSFjgPBb6jQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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