SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61e33580c494831709acaef3e51d85989f298e461e8db79d2ac43195ec66b48' 
  AND token = 'E1jgIKGx/ZZSxOoEsCRGYFttd/KwJhH/Qj4/pOYFtmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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