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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717cae455cbc6d1cf6ab3aa232ffb9a310ee43b76362e49ff59832ae1155a4ef' 
  AND token = 'cg9LlDdYHx8qVZqnHdhDx1bcusOJzXism9cHwUWtMbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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