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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e742bef036ed9c5a278c0bf0264402b48f70d6d1ebbbb5bde4449b4a25b810' 
  AND token = 'ufstnSePeEF7e4vYD+KyNRzq8n9qlNKquqE+SwZZQcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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