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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29466691f5c42683e4512c4a985adf70eb54654ef47db57d730243a035675c2c' 
  AND token = 'qtMr1rxgZu0rh2lMEpC46nVLoC08AaScFTqKe2QLH7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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