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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3b07ebff36fd89acd14dcb08a19c8211e766bcbc9856a0622e20dd9c28246c' 
  AND token = 'cJPnWK1ow6IempotmOC+jf8xTnFdVWRIJ7cX5tvoXos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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