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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c1b896769c108ae4cd61b9bd7f489de7490c6eb7cd527a1b5bb2f2914430bd' 
  AND token = 'ATqjC9f45et0eZs2oCqNtn0hLd/D21S6dJlYdYumD1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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