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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4dd61bc9eede576c1f3b75db3fb0ac647920fcc68818596bbeb3b596bfdd59' 
  AND token = 'zdfGPEgegvCqHnlbGNrZ9KMlKK/ZjiX3gcaYUXt6S5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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