SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046e336d25090198143a7686e9aa59ef88d27a1e7b6f5507d84d2d43bf15c448' 
  AND token = 'laI3qp6LQfQefkiwBGw4EFW9IR2aM0Rr+pFhLMjccbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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