Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4bae9e18a38cc6bcdc9353d49fb4a900bd15cb0fbdad7ca126cd23699a121e' 
  AND token = 'c3wT3ZvK/y/b69RTfK6JumPq56GWNCpc41UUb9WOLT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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