SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a2fe05d817ac239a48249c38f61bc7004cedbee304e12fec845f943ab214fd' 
  AND token = '/oWNBul8HqhS5Udn7+3OAI4IVzYqu6WPvvuT6kJ++i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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