SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b102c6c7ba47120ebbe73a86eb405cbb05a347fc313755b557db2350a9ea9120' 
  AND token = 'wo+ctehboXeeGRUF1b6FsMqFVM27MU+G6I1e8J8RLW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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