SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee0b2c459e15872d6970baec56d9f7d4469c027c7d9e091dc015b5cec5b293d' 
  AND token = '4Bt+3qc3ULcbWXQ9NdTC2nn1cjNUHCjct63opSK2NRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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