SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91feb7ca62b20bc4327769f9a0f9345781b4bd1abd403e772e04d8a5bfc7185b' 
  AND token = 'KwCZ/aSXrD4vbUoJ1jb5+FgoGM75EbqfUUYAYVNF91M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables