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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35de5ad30330e3c12e9f4ee77d5ddf7cf7c7008262cc40e8994bbebc5885f10' 
  AND token = '2XyQCU3naNFNA4tsE8XH6Ah1bd21BdH5ckQJXoGSIXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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