SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3961d157e5c830c58c5fcce328cfc85b6583fa418c8501c891d5f47075c0a31' 
  AND token = 'hMWsbc25gKRbUnF0xWZrAdN2M/WE9/jgBuznd6DW1do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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