SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b41b8d77b20664e676a1efc4c62059d1451713db6e2ebc546158c1ad91b44a' 
  AND token = 'EqwbK4nMJMiCi6jTmH5vNpnWt4+UyYxs7DH7Br9fHO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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