SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf7b9e13ad425257a2d161aa573c4ee4f8bcc7273431940ab3f4e3da3cc71c8' 
  AND token = 'p4w6OIo9HGruxbCQmTRyvbxo52iYiOq3+tEhgVjAJPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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