Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79d33e493396cce9c6dfa42e794a27379dc6def05d0832e286cfc8ddeadf284' 
  AND token = 'rmcHAlPkRtkN9tmCA0BZatZR8CwnSFQyLM02rzz2IVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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