SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4763ab4b9eeaa990ae0c92d0687a41e3a23ffc8c9abcf760d412291c953dc4a2' 
  AND token = 'JVf3gKKWXnrT/jf5ZurkmrC3lZrQI7TgNw1ClSYdvzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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