SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a742a36ea7466349a92cbea32ac0fbd161cad7045eeacd18fea08c11417f7034' 
  AND token = 'aza1oD/GoiKbwyy8QUwdORa7zTGQ7Sictph8fJLIGIE=' 
  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