SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3ea7bb32da2c8c7ecd1e5aa3f317375590c74de516a1e535100063e75d690b' 
  AND token = 'PcK8vw8FmHCbPnSQQJyJA7/8WXP3YD8zW8eNVryRxFg=' 
  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