SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f091a8fc97428d006df85e4e8b4b77d58f2ac33e350b4e21b4691c5c9fa7fce' 
  AND token = 'H2RoCHwlYIVUhVh0k9zJ8qsRvf5oROWJ+RZnW7+xx3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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