SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3da360fd58da660fb73dfb213c4776415194080323aa552b05c72de1c59d01' 
  AND token = 'ieUxAtg5wPT4xoynnky0jcchzy05W2pWTnt+gMOaqro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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