SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd871f74ba21e3db6595007733cc12e9ec20dcf932e9e4a40447f432c797af87f' 
  AND token = '9tzLsCgHAQ0Da6AWxC5dHcLRxxoZxXfGJdtsvIs+Sgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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