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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbbcd6ae7a50597de5d0efdaeb6206f8b0f98b9634527597806d4d3030cfd9b' 
  AND token = 'IVt63Qf42e2cZpObzKPqYztZYxrVHJ8keKO8zXaLS3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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