SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b906f59b1c959b9b38f7ad595fcb4c9794f5721479d87322d166d202854287' 
  AND token = '9mpb30B9vs+8/OFrP0Y7p3fYhhM8LxIySKh3ciVd6oI=' 
  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