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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fd6a12a63833660e431c0bd10b5f8ed370722a3148c60357b0cca8dcbdbc82' 
  AND token = 'YbtqWWXlxK23wPVxoZ+ZJ8kTatpSE+UDlWU0z5Yaiww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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