Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d24921730a11f74361ed341e9cdf1da4fe5a98315b5423868e5ba8c593007f' 
  AND token = 'msV+cQMY/Tsfesx1zREQ2z+HsB3B8XkQ9porjxMviHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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