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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1b19469416ada241567f3c5e78505f8c2abb942e32597c75977c9b24b61273' 
  AND token = 'UouUTxiW0DCzSd27Kn3NKrodJjEo+W/nxgIrx5yyjpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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