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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dff8eebf6e44a8e61c0713cd14ee6cd81c23dd840cfff86bfe2778e44f42493' 
  AND token = '8WXM6wkSbn7nGt9Cay836VMJYnt9ewtjbs1ZBb062A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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