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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd70825840fcba4eaf153d3eba31e97ee3019bc6e8065d3f711dfbd8c5a8252b' 
  AND token = 'J3tQchPZpPVW29I3G7LyViR6rd8m8C7kXma8yd0uy6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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