SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f70917002834d0b932c5fb3d4dab0d7c849f40a6af9cd65819c59286f26f4b' 
  AND token = 'GtKV4rnoRIvO96rCM2s5gzSUnl1ZyEvB0qqseMuQXY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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