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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac78e99659902ad5aaafd8785b03a56694395760c3311a80a1d9f985cd74f9c1' 
  AND token = 'selbL3hcRGaHqev0bnu6o3UsGoiOEowqIncJ4ZWBPuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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