SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6607022ac123b9c08d73af18841afcbc77f2b1025f64fcf18b471d994c6eedf' 
  AND token = 'bNKZCJcxnxuv7GDb/8TGr9FSmz2gNIxay2veDVAi99g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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