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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb1e65b83c39373d6ac9fd56cb22f3d1f3438bb36556986b87bf683059c9429' 
  AND token = 'Hp4umoqIz37ZuhnQY0DsQ2DjX1yoCcvfruW7AZ680uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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