SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c709dff60d1cc36b06c276eba1354a9f9789a48d0127ea8d1e731bf69df3dd9' 
  AND token = 'fBTaGMcH1cig+AJELDiEA6z9usQyGvsH1uOvkXlBXlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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