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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6742a759eccd9329a23f2c13e821f0e37a7f493af1d0eb593ad06e635d3168f5' 
  AND token = 'SBKh7KHV9Go3Yz5pPg7ITIRL9cOZfobProKhretKU7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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