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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20aedcc13ff4b36e6ac1a9d086bbac5532f82bf2d11dce60369faa3757b6ed37' 
  AND token = 'MegvaPReVf9DeD+QD9TdVhR9DGFxXWuOcmi04wUf1nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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