SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa93e3e2633e51434644bd60a082027da060334c99c05b8a8e79f6d56dc2591' 
  AND token = '2Y33wDBLwkHbgaQLRB9LQ0kSMuzwPbpcBsIC/wm4/jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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