SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16061335497c88629fea1bad5c2f4a686e8619ee6a4491d60a8a185dd2661dfc' 
  AND token = 'm+t+rNky3qgIQNaR4wM8bOPkZ+8GEmKsPlNqS6NKxF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

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