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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bf9b3e39253c6ca9b37c75116b5debf41a5bed6dce7193bf31f794869434e4' 
  AND token = 'gD1nH7ETcXkpoT09qbsKdOHhLqm4JhplvNxbcfc2BD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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