SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b1e6b7ba5cf728c50c58e4eb52c7afded72ec773d23c15b1fd0496cd3fb5db' 
  AND token = '/kG+xLVvGg4zGuqKqIzzFRS4+HHP1v0FxCHCUpzcZmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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