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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff92c464fab6408872256d4f53aa9c570aa2af813a3861d1b196cf31e863cc5' 
  AND token = 'uA/TAkNiSdpp+CJNhEeFACBSi0AyoctEvm0/XgDuPYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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