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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42953a114d42c814b5323244001bace7e64116cf843daef780c78d31294bc57' 
  AND token = '9c4Qox6hbyIXpeMfBina6dIjkIOXl1NQjdsGX0gWchU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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