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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299f638c96b854d456cec1f2de5d063dc197a3b5c5caac51280e3785456b62cd' 
  AND token = 'fx+5+WHsntf+vQ1jsjCWr8K9BLQ21xo2TiL5CQ1pwy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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