SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed130273ea4ddafecee779129be2401348734d8f3b0165d4397853f0563f0af' 
  AND token = 'lIXYhzE1DBG4LvvqtuSafv3HGTvbguSFL8iVKAgGRzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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