SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad38d1b85ef9ed4ae442904426b762fc0571258acb71f5fc778867f93bf6b36e' 
  AND token = '1lilUsvrLVBZUDfqN1n0uzDOH5eitVjFtnyIZXsAG1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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