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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae67c4468c71a32eb8635584bc140177427599924e80bff650a4ad5f46b98a3' 
  AND token = 'phVWHFXJsEuEzxGpSIvoJaX8lcBCMcMNtMPwT85Qcos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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