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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c3ca0777c1cee27738575a95b2f8792ce52be293f7105d4f0cc9522f1bf36a' 
  AND token = 'v83E16LjK59I/N42GTrnHCsVxc4MoxeqQ1xwyxTk6FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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