SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736cc0d8a3f771f0398a5689f22ccd4114c3088a8d8c4a4beff0995826a8bb5d' 
  AND token = 'qMx+KnYB5jpUooKpDaQ5oJs01bUy28zipXZevBgIrnE=' 
  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