SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a65edad3a024b8a0e54e26577fec3f5e35f0d8f291163d4605aa7f6e4b1603d' 
  AND token = '3G1WVsoKOixx+Zv7jxRsGi5wEl1vJm7sVpm0Yyh/fhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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