SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde5bbef8faa9770d3c8a58b2ce7a7569cee57282af75b753f96a7fff2f96ceb' 
  AND token = 'KUo+ME3QvisuDL2zQvkCOri7/BNInAOy55mZC9LIYbA=' 
  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