SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54aa784f4d64027e0ce4d82c5ff47f740cf39d1294e05bbc537eeb17482798a9' 
  AND token = 'ZxOi+2+luuDUulk6Mp62JuqU5K8d7OsDHDCbfOclPCU=' 
  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