SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b89b59792407f635723d97195eb5fef552a55bbcdb027251a89f879bd1e890' 
  AND token = '/3xCyzM5Pa5JlDvxd0icd9CNV6b8Hk4H/RU8b8mCL5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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