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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e719bce6cde28040abd150ea670cba2f4e0d266de84d0eeaff192ce42b9f3fc' 
  AND token = 'Hzd3ZsEbUiygUGwd1pSA9sbKHS3XvuPT8UqQ0ksHWpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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