SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426e234d9be2d0dd3c2193b51d27e602b6935a1169133cf8d70edc755a0842ce' 
  AND token = 'gtwVnS1N/I5FPfOGEffTf5QMm1MHsvcgl8hHdsJ5918=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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