SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c0d5b4cf902bcc773bdc04adc968aabacf5e7032d81d8aab43cbad6f27f5cb' 
  AND token = '0x6B+QGiPSAS8m5KSXzeZDBmn6t9xXg6JKxBIfqwAjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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