SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775c1baeb2a403e26b304a01b3e7e548ed275fafb9758d195135c310fc36c5de' 
  AND token = '7d7xcdG/Nhzx5VYbv1eROVrCF1aWdjWH7sMhyB6SRIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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