SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac76ee78d1dfaf5990203862d6289ed4951d18c35132ab9c48be52d3c778436' 
  AND token = 'LZyhNhOiQnpgjMtJEzrxpTeW7dVWP/78gV33zBtbXLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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