SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f33e7cac4849ba7ac75cef6019e45339f3e28d8ad101187cbe7f02a63704ab2' 
  AND token = 'LclA9aOQnKVDkAMB4boDRt9x5mC+IUEuxzUpKL1RShI=' 
  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