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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98505040db56c9e673a8ec78bce7aa0a6ae83d3e8aecf73239d32a43a9aa038' 
  AND token = 'QhWIcyJSV8UGgyfLJ01wYg/wqEEnpTmRny2LqQd5hgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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