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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f40569eb977c6eb837f3e6d7ead96c3e495b81d557abf252477a4efcf3e629' 
  AND token = 'WxrldcI9qnr6UL4xpkIIqYSK6qblZDJfWtBgteSVJaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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