SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5dac94cfb659c77040bfe01294cc8b72eea45224893c8e158d8a156ee4ef80' 
  AND token = 'iqnEv2g5g6eu/GXAtlDFL2LXH9Z0y0z+d/eVmnHT5nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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