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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de671c9126b1eab59a1fd79c37b9a9fe5764cd8ef9fa980315ffecbbdae2a3fa' 
  AND token = 'D+faGz/GJrNJfT95ymXywe/RV3U9SxHLPjXIZK6pnkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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