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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6b666e1363a8658e90be7a62a6c21fb09ea6435848ce7388cbb3c3ebf9f272' 
  AND token = 'GDocD1fH5f1e7GxQjtlV0ntHrsVAjysLv0Gf7d6BRo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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