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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3a50955cc8419ac1f14ea196e90df5c6b2afac5819f7659cc23228339e8110' 
  AND token = 'nuFQQ+PY68T2ZIh3lfcO/9KVWl5+5Gne9SJ9dOLOc7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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