SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03ae930de40391038857180df1d341de01f4cbe7ec2234f53f64ea9746f76bc' 
  AND token = 'IzAx6iNE9U8J4IzmG2ZIFNTj/Fv9l23PD0o7tjNKuTI=' 
  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