SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb702ea0f5cc975f0aaf8956e00d4d78fae9677345215c35972b4d256f58dd85' 
  AND token = '+xkqLI7zQwvWAXuxJKKVOpvLF88kK8EQzjK07kwrvxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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