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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc083ff17d014cc50cc1a0346ef4e4f7ccf18ac34ba8659c6ff6eecae7e7e93f' 
  AND token = 'iejw7YvYQBL/0M26AD6kAZrUYg3QEJkXxCjI1a6jcOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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