SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7ae272b769ee44762f996ee99f627fa21ffbb2fb145b69310cd2d31ee6a7ac' 
  AND token = 'cL4Fc22RYxdhSrie99B4QzwPWMkd0z2eEbJx3HMf/lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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