Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2568cba3dbbdfa8c98e098212d3d60063ddb33e5095cec1f1577f95edd52f266' 
  AND token = 'JlurzBoHUEPGbzXwoUhdT4wO7WHAyh6uLGeDdTMdgHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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