SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2964f6330d4f926b7d2c4bf99db6fbd7d33e080c0fae3fda63663c1746e662' 
  AND token = '0jLCx3VILJt7Py4OmMXZEwpDXI0pTY3CqHcFg/rXC88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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