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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca471d7de236e537806e3641c34108858214184b0600492b120accf73171e60' 
  AND token = 'r1ZANiZhMMoZ8czsdVPZuGWZgzmbsjhKFvHrY0cq0Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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