SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099c7fb93c3e4e5624fcc9fc0ce3f834f99f0816a2959b53bf23204a77386356' 
  AND token = 'ux4HZtQ81rEY/A9254Gl3kdc8Vug00IrvgOUTz+BOJg=' 
  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