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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de7a7f97019461ee1f2166b67aa9c5d67f836fc930f6f2ae94bb71bbd163252' 
  AND token = 'XGB0HTPkhL0HrVyH3Y09w/C8SysyDwxBsXzar97x26M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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