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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085d5360e70b05aa4d35925958adf592253082fdd37a9f7d28477eef4e03c851' 
  AND token = 'Q0USdoG9pvb920EkexvvF6qmQFUl/20xlO97iKBWrAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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