SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7db25fc2b675acd7082295d0ab76f79d31aa105aa65e92d580be359a0a9184' 
  AND token = 'Vn0x6Bzb/6+sgJ1b6v3VfOHTW+wtZ1MjVDMHLFp2ZA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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