SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2d05ebec37079b9d163a0bce9380175f6d65a4cfc912a205f6227b7b24c33a' 
  AND token = 'PwK3dhgcSMdIXbHBwrJNLQxt+fZVeUAV8p7xlw6EL1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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