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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a9c9e2ef3e7f9ad9e1615f31dcff4427ca47477ae6c2f27cbb1bc5b38ac05f' 
  AND token = 'E6fHFvZqfoVqUPiBZa71tGW7TXY9UTSzm2BNUzXN74k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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