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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8acb54fc04def101e56a9cac041ec892fc0abb3fc08767f66ee25ea6cc6b17' 
  AND token = 'zNpKftwNmas9LNDN2tPD8laVRXVc6Jj4jTOqj1fbS8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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