SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba243475672fca101521f5cb0cc492785dc4269485982ac9f0cabbe87735703' 
  AND token = 'GSnlnzt/1TbsM7V6Se0pGd75IS1AksHU7Lctmu4IhoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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