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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea85c2760b4e388236698cb4f54852b9684256ab366e6a9c841cc5ec0bc2ce9' 
  AND token = '50g9W9grLpmgApKuPJn5EDRpcjkbJKUDqkFrd2YXftY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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