SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc5fd48bcc22ea65436571248c741f3602446a3d40095a14cc0d5be50107ccb' 
  AND token = '2VcNahcSg2HyB6wLA/opGiyM2sV91CkZXXhbFM5QlfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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