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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cc7fe204f944ebe9fcde49edd6bf2e932bf14ab8ba223a1f35bb26496777b6' 
  AND token = '2XtKRifVI1WoXuE/jTr3Op0K45AFWyypGOomvzfg3AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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