SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33abf5beca66c060bfd0f8d91951fb70697fbe0cdd9804c235af768f5331aea2' 
  AND token = 'slMvH+b8eVDmU6c29akrWsxYfpLNlf0nhhefyiLt/J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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