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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083d5215e54bae93ed95cb594696e3565e68ee0eee070fc80b9b522eb4a802ab' 
  AND token = 'jup59UIEX90yRFrZlKzUhskW24WUGWBeMtavKrLcvk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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