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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df02a4cbdb781015b660c0c03a9f7f0a37b317c93e18217559e47498d8f1a1e4' 
  AND token = '9kRUDWUsH10/83hvVTi6trGdTQl93giqLaWPwrTW0Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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