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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb039a8f3b35ae840e3f4f466ed1cdb9360afcbf9b23c15db63604f712f7312' 
  AND token = 'bgwrETOYHVYOrslpeNcwCm5ru6/J0drtI3mvSxvoxKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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