SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67b0200b0c4d42afc4291a39db0e2241b60542f807abe6a9fa72ac3394e7c22' 
  AND token = '3UOyk0qoXlmEFNskn7KAlWSzblaP8LaDTnLbKw4NF5g=' 
  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