SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2eaa38bcd059ce9713f863979cd972c277c569de8bbd962bb245987c52dd17f' 
  AND token = 'Y5un6PrHjKVzDYh4FnI4f3ur7fi4Jw/801LmBMQ+jKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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