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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd812be0688ed5db871c5d3c634f3faaf899893969f4fc07bfdcaf864aff804df' 
  AND token = 'gsAQpdm2SAtlLi5a4Ve8eXJXVmgian2+KUMqKCDNboc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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