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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b1f651048af87d9910ac085acfcd9dc9d69aaa9286e2cb742585b0f92a7b303' 
  AND token = 'yDLn3WfTVDk9O42Ob00zkLvP5YAloNvdB93Y4mwKovw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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