SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55241506ae155e60c3122e0ca5e15330de19419b7525f368727db5d8e36ef4c' 
  AND token = 'EotWzK6RQ/XyVREYxQvR+ajrf0rjUeISa4RMCjhI2yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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