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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a3f28b7ed26a0aff0e88e478a899141dcd007bc555b5ec2a14828d22bd9f3a' 
  AND token = 'VJ+7y41k7g6RrJES1yEnLNU2ghapdIESTbzFN9jL5uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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