SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afc06cd088ae94762be76232972d1ce43b3012c2efa1c276a5bfe1e3f39fd5f' 
  AND token = 'YUJJe9wCCpuOLZGPS17FZDhpwQHDTjcriB/tk9jTMHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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