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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0c9da5914c4ce17d668cb57a9431f3e0de32be0219bca1766957aedb423355' 
  AND token = 'YahUYTpLkYbQuPW2hJzuI1gDj7sI0i0RzZcx1FNvL+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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