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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59cee5120e725673424e7c6fd6d3ff76d66e6e8da0a328e1ef987d374414e4e7' 
  AND token = '7IWRnRVGE85ESQeYJhFvNYECKk6tae1ku+rdWG7hgMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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