SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb5712bcebc585fee5fb7b54575ddaf96aa9126178881a6bf2ae1c8765f86cb' 
  AND token = 'Mx33hPe9UkV3xQfhZK1XuLdJ/MBAc6pX7pnylPHaPnA=' 
  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