SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca225c90db5b7d2a2303412cb6473d54974dbc41e2a3f8fe52b373345605ca2' 
  AND token = 'bHFFDJpfwcjQ1BkGOELniD+v/p8JhcK6lwKAQvf1F7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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