SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69daf0221e821d57c96be878643372f512fb2c3763f358805d12b4bfaf8e73ad' 
  AND token = 'eIQUwfeQFitu5xrGhcZoLGTGD9Zszx+jXPo7VtNx7Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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