SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08c0f76de9172e765842c9cf53f7a091ff356caf48c50060df2f1cdd59ecff6' 
  AND token = 'Qg60YHmYE+bUGxSfu+gzvkuqLksoPHKhekt206qw9io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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