SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b8e9e5652a48ba243d82fd716c20219945732706edfd6eb8f02fd8f08be0a7' 
  AND token = 'NVBw7TvfLBv6PfsN/X7h0bpWljqcKeapKviWO9YOn2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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