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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c992cd1dae7cbbe4ab0679504f93d614105e5041157b9a221bc6637fb2ef60' 
  AND token = 'HNIYtCWC8OyZG3XYiGBgx0Mne2V94le7z7+ak6CdA+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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