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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a24b1fe6e75de4ed4901137fde1f797776793f782ad62cd61387e9ac62885e' 
  AND token = 'OWmQZoH9DPtIGGu3ArEn0i20Ei8YgnZ86Z6dvKUMIN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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