SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6046bd35601b6ad80b88082d914590e29f10008a62514daa13236bd8ceef62' 
  AND token = 'BQjB0qmylN9Vz4P1UI/XKm5Q7M5dKVBWrnvr8hJJwXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}