SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b550dd416500a977b39ed29c684586fdd383dbdff58517c077ed4f0ce26e3e' 
  AND token = 'WZ9U3kqFKUhC0XqYY/AY+vxmwbNF6SJo1E6auBFg7ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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