SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4083b59ef7113b3e5ba15bb6038031759dbd29249118f6724059c42a7747fcba' 
  AND token = 'oF+FxUF1CK2ile9Vj+BgMhdOIGE5I4QzpJ62zri8imE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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