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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d23f7715c56586dfc5cd791737a68fdcccabf3df6da4f94242302f659f9df13' 
  AND token = 'Ddir/1kUXQ4yNbtVnWlP9LvEVmYoehpipDjtFxhi05Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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