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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51cb71470d931108088b8feebb8d18b8da2c53fd0185a311ad34381654cc9a68' 
  AND token = 'fFjXD1tJjqLr4akkTc7SvR5O3SeYtZrhNwyzeWyuJAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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