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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff328397000cbfd3d8a4015375c4594cb67c7b03dd4f3b4ee34a4bafe600915' 
  AND token = 'swrIbLZokFnSbI5bGSsj6JBAY98LtfpLfmLYkPFr5JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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