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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4233d4fbe5f5bb0cbc3c13ee7f65212a53544dcb578eb021ed579c3e51cbde' 
  AND token = 'dWnXt11Be0Su+qD2k7hX9PP5uOU7f7BdoXu8kM9oZfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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