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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc47939f85339012a92d86412c32ab3c3e6284b52b8411d54560ba3ea3b739c4' 
  AND token = '3qbHLbyP7lySWY36ctYCjfIbM6ueWRnjRKwQ5b3xRJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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