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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4234707c3d0d356a8c1443bb9ed46c1a2cc8a7ee2a4634fa77bf24be7999d79' 
  AND token = 'ulb27yU81kS+0ivCFZ9Qs7vmTmH4JGXEvdUoMWsljMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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