SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f1a05f92cabc1270aaa8ef2e93af8dfa6c31e87c802ae0195df0a4a5943c98' 
  AND token = '97fbprRzxue/y4l7jnC2NoQfvHNBpLFju2xhlPDgN/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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