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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f1449d7b350aa5017ebe9a6c2bd54460193904cd37aa33b996ae65d5338819' 
  AND token = 'Gj80NpcQRfXmCs1jlenWLGHlgQs1JZypZemYQMBSZB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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