SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58970d20e84e2ea45538108f4307d633e4595a9821fa7fd552a31ac9f22b9e89' 
  AND token = 'UUnpv53RTdqQApbveKT87Mydp5V7EVR+1Z1Awwtnfxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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