SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae0f5c5714051499f1ca224a0cb687a1effda15c28d5c4a8fe65b1de84906b9' 
  AND token = 'SZF0o0iUU/1tKMRHu/ic+ZQylQyxAgRk3rKaJ6sixD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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