SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429b5343e07a3661d5d8dd5795eb94299a6dfc272269f04730ccb59b3c7bee27' 
  AND token = 'BzZPXJ8lNhvgvOOHwCesLtwTW3zy1sUDMDrKFbIby7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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