SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb3cdcb9ec54b57f23587c83d40d9d0953b7aa92b4a5f39b524b0ef3a551d0d' 
  AND token = '4K0kG1OfwSALQGM+WGNw7nwnQASA6Cged5W/yCeitzI=' 
  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