SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d36c199981f3d87697f28732a734428bf6af2be93c0ae1ef5fd006da4858a8f' 
  AND token = 'UuWtk+TPyWEMcYhC7ef74bzlds4GPDTeqCPeoWiehWQ=' 
  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