SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63978061bea23611b2c8e6f76dbb26a9d1beef7803fae8d3e963cc36fb9c4955' 
  AND token = '7k3EAi1lCgBxkchx0bsMSAqslLdEy1+XZagPN1xeNhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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