SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd61d23b6a4f25bafa81f6320fafdf2578f77e0e820c5cc3a27276f4fff7be9b' 
  AND token = 'VlmGDTQ3wLdQet7+AmIoQ5VI2z2GZQG3gLnGSH2qtzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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