SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1743be84a60be349815c210516706fc8ff594106ac3848b6ca4ce6d0fb5ae0' 
  AND token = 'inkfFOhMKHaxQgocFB+ZRkpmGIR0I1aG+xEaQS0PdOw=' 
  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