SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7623236754a33aee10149ec016d7d15a0f1d949bb3aeb3c81351c72ced865e7' 
  AND token = 'UuLRzjTmuJuGqj4M++YdDx/L0fJwL47nTpY7PzyarEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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