SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f04a5efc95d2e6fe47d5f0f2008f51836ae5326d4dd31f7630d0177132d8042' 
  AND token = 'vPbMbPpI9UMmlFcUrVOeqltgFDz/Y4CZo9D+uj2LwHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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