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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61416eb3ca540dd4e1e1baf6bb69a6db997671f1dabc9bc03021c7d56f37734e' 
  AND token = 'h/9b83eFHf2h4SQQ3nQb6vLxbSIG2j9koy9j6BYod8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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