SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ad2a7988ffb50ff21c732e67d5ec365fc2269ea4b5ab45935d61c131a1fcc9' 
  AND token = '/1zC3fi9h+XHnqQgWDtS+7mmLccnAvyWL+ZigXyByJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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