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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f0ab771a581a5518355070a18940e13e7de1afc54b04db8b2e9edac702c6d2' 
  AND token = 'nupgC69d3CLotWEzaCS44ilSMOMHfRRkXKb3KoQGfIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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