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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fde649720fa5196873f40d799293cedee477a3f57805b24b6ddb705f7b1399' 
  AND token = '1397WgbRvnzx/+yu8iE5E69n8lWg8wh9bGaBv/q3ts8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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