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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511e481426d6991fdc2fcf0753bfbd5a89b67074daa5d7d182eea3d7a1af0efb' 
  AND token = '8GJ0OgZCsItSr41oYI/On8cAlQyPj/e3pSOcqDyF2c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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