SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2add2f393afff861f6bc0975a6eb0814d794665b86d76647aa01e4bbfec1837b' 
  AND token = 'IeF8V8nCkp69X/ET6mG5gkXJG8kQFoIbsAoHHMolEpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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