SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fce62277a8f5317c71714ac92065517910cb028359f842cdeae4a77c21b1df' 
  AND token = 'gN+m6luIfzQdVl3ifwvKEQeYZW/iurSX/JsU1T5b3DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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