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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d42aacf3de0a6f95b4bac035b18ea57745e58d11653e3d5f7698f0cb764058' 
  AND token = 'Wg30chWrb1wZDJGmK2ZVSGblS2GsCnVfbpTH8sHh5G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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