SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6580d778d6ada45ff0ab1d645df24baf5414977386bd913e5f39e61fb818b52' 
  AND token = 'BfAYZQyK12F30OlQRT76Zl8gJp/hZQITE7qX4uwuk9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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