SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33194e9912d7fdedfbac4b5c310a9659e5237c3fd3b88eaf95bdf51c46a3e4e' 
  AND token = 'Gas7Zj0O1TIYJjTcPIggzBjPmg1G9lTUSJTG87/jT3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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