SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866e6ceb7e8d951cac19da35230482f9f6f26ca1bf70f5a865b4de3d53082feb' 
  AND token = 'qw9LNUKVgmVlbuDkE0hKK6nKmPZu1gF0UHkRz5U4bvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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