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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f419b1919ec19ea32c30adebc3c481536aa58c6806721f00fa9f834e6e8920e' 
  AND token = 'Rdbb2mz+WPn8mn9L7HKpomv9r85UCIYmsHyi+RrBfDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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