SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed50c72a1dc2ffc983d4bb2a3106aad0e3d9b727388808af7c454a3cd995761a' 
  AND token = 'oBoPnx3FmsY8WkE1OcbU15JGlw47xO+OkZ0uNmQ6Ock=' 
  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