SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831932cea856f514c7b64459d5c4e1741eacf720dcb8f8198a7e25d868e36253' 
  AND token = 'FI2LIRjEGuT4KPmF09xcL/4zI0/TV1/vOxWUiDf1H7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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