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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b268c48b26b016d8e5bc621f0211304b239909855ead26813da83e26bdcce4bf' 
  AND token = '3mJkC247XgzdCxRV5PHeWiZi+AnijI5SdsHvwCJ7hWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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