SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29d6a563f1fe62a5c66871c101fd464d2f5623cba979ae4c89bdfa4558930a6' 
  AND token = 'tIAZUfjSV38BeTDUCbKZHCDlG1EuWdTvxw/nGySelQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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