SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd24dc040673cae716217d892f7e0c21eb71777ca502b006393e1e7c933476d' 
  AND token = 'MejxR7ghDM2d7Fhv6xMRKVYP90HzWPA8g+9pczUBUM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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