SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c892126cd493438c91644d7496faf8c18d765f3e6486233b2fd75613f509a23e' 
  AND token = 'SAaQrW3gXR5PGtOK8DUD5+mHc6ha11GJ3iqnaxoKlZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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