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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390cc4b5fd1b24829134484a1b597543ab70c0462826b8de23422ed7de81ae63' 
  AND token = 'kjY62kEUKZMtu25+M9oIqsvfyxz7zPk1Mg84e2lkVn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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