SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb510df84e7c8d2f231d19594aec466d05c10b52a59cc7741f0519f144f10d8' 
  AND token = 'KKF3ciulAaLniplG68U4tdKiCgwp/kTSNg596WDsbaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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