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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257ce01610fb35ec16a36d3e8d0a29720c7d7c802606d6871a087f646ba24060' 
  AND token = 'Eez8sRy0lPKubecTK/f1F5n+RSHCUGsxMBB7J4d8Ydc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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