SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4130fc634730ef063983a632ab6054d869adc6cabcb5162bf7eb9e98f0cbd0e2' 
  AND token = 'WLUb2CQJ7uqhdSjkDwxXNLKJL+5h8TfvxGYVjIM9wGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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