SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebe3e40c23556daa83cb1d5eb3cd96109e80381950470ffc4b4403711d42621' 
  AND token = 'o+LJtaioIB1AiZlDdfKTpX0WVwKVmyItIWTeroxTIrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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