SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37cd053bf77f12d8f44351b596451ddd7997f5c19dea7e46e8e90495fa9e5722' 
  AND token = 'jGQNUMCfQfGIOErr+dmbyFPHgmdKxA68nSptmLhy24M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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