SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ac974d32727379172f96efc6110388399fa3fd722673ba6f8ce32de1205289' 
  AND token = 'ojMM7H5UpJ4AHzae1/+tm6tzpBOKJVmRdTdPzbXjZx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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