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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb23825bb38016cb2b890344e6a7d32b992ff7c7c3a6fee158d6b972d24d5cc' 
  AND token = '92TMDglZACd2XWhtynqssFXPk2WLtiY3yElIgLgRGDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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