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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a847a3d3c89f8a48ab42272d6ac553bdb0208674ac2299d4b42f9036e17abc1c' 
  AND token = 'QmJQx7dGNYnhy8/7Re1df1303hmgwUDmYy4Xeap7CFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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