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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be2f1c7721fc7f17a87d6059f757c9975bc12e13b325fe6eb5a71ef30c8dedc' 
  AND token = 'WGUbzxET5nsauTcM55M3rxcA3f0RK6OkgyrwZp/cMac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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