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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e298eb96d95fea225074eed1b25bfabdf54522fc11e5fc976a66877aaaa788' 
  AND token = 'nDjuLXaXM8eJA0+UwHUHhGw7DNyrxHWAj7lcqXfeq4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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