SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b15cd6f5489e59766d1c65692c1064337264468b72caca00564a7d430c1955' 
  AND token = 'Dn7EzETz9E0Ot3q5uhSV0qOblv9iMC+iCgBfqx8VX6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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