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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcd0f504491774f725d988191d1692d7f8e4aa59e9a51ad653d7fd96978b6de' 
  AND token = '9Omgo2VDIQpWQngBSv8L89i29WCICH0q2dllWF6jue4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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