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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6baacceea0efba30c75d525d7ce51c608d8cce712b0a6a4f62c7c549fc23a10f' 
  AND token = 'vfcfSxDC6AUgtaBz7EbSw2ihSBECXwqP7FuM+LzIJVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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