Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b805cebccc106de324aeefbc08221683735e7b043861bbd17f654acdbee415' 
  AND token = 'e/FPHPQyMOnkdkgEBRyaBR7328iNxAQsLCUR6oWUqmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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