SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0182ea1e6fceab127f6011f2d66fac04f6470d524219669efe4e119f757ee010' 
  AND token = 'hIgrp1swtB4+nKFH8zjHpK3KzVJGEmUHAlhJHb/QVWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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