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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6965334f6aa435381a190ece553cf16289ffb88b40f91b3da03440bc358e2d9' 
  AND token = 'aVtwOocHyaPSkj+99n732Z/OL8dvutt5wTXCH+RQzoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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