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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085d2ae5227ee6c67070b20c9b37998d59f8c27204b0c5a175132c0208a78405' 
  AND token = 'UZQirExrihnW4ANSXXawHvSDE5aDzCyXNCI5EO0QjC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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