SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2203c801aca2e3b23f70d1972643f17ce08bce56d673d329b0828454bfc768a4' 
  AND token = 'gJOTok5OJITnUVYvOuGEGNT9+97/4C9PjRm8PsE7/Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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