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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a083934ec75c41e567cee192d6a4df66dc77353ddc8a3813cc32c7a957ec1c7a' 
  AND token = 'QjsiKhMj30aHRzDwFAYz3K0FBActpgZtX0o3sFN7DnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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