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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afcf621789fd3b8608252985bf48af7c3097d6746ac561b653e5572a8f2ab1c8' 
  AND token = '15asRJRv+X8gdkFjueCjMd9RnXxw4ZTxBotk+8rBkTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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