SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07debe439ad2e9b274f4484b021528b34426dd18674e18986556511ac24da13d' 
  AND token = 'IR0q0h0W0rvZcxdwcfRcqPuBqvX/8Jc9URjEgkKOwcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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