SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87068b5e72b5a188acf8bda91622f69d550e3a7cbacedbc46a1278b0b21e8f1e' 
  AND token = '6a6/djvT+l4rxstgYAa2D+zRUIzZZmw/9St5Ce0GnkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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