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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b43861728ad957b5b8273bb87bdc05213375c8544ac554c95115401bca633f7' 
  AND token = '6VSP0EvLd73kvVK2AFdh/ogRq6rsuY9Fy9Cv+EvPpLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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