SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c82d89e66f5d8ea95316dfa4400d5df175ed0143c770a405821867cfa63ff3' 
  AND token = '0utZCcLMdt5k4lfhw68/b6BfGxttUP1cdsX0Mypr9tw=' 
  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