SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17acfff4d2499ca86d0762f5e1b36c723f56e10658d38191e89d06c0c56c82d2' 
  AND token = 'F1fQjBwvSmhF3/GFUghWqEuf++6YX/h4JThEbxa1rxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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