SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661eb290a723dd0136f3dcc6f8454c28976c0e60ff42c58f319098c793829753' 
  AND token = '0N30WyBqEy5neVM9Wcv/sP9EOKAUARGLMVxiF6nAnE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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