SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eda2bd707656a69e2f467ee5297766b94cf17ef8f930bd0ada888d6355c875d' 
  AND token = 'cwqLlqoKV/qWnYX7QSUuXO59JqYctTYXC0Hz1Be8Hmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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