SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd629c0cd4da5fef557e2562d5dd96d90a72162f394a53e68e7592f9000737c' 
  AND token = 'pOFel/RgcDkzUW1Hi3m2ReQkzhIcAwWikU9DSaRycdQ=' 
  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