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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d53e848d185a5fb9efdedca4d3af131de271e013220174e1803081cf3546c4' 
  AND token = 'Cv8N8a6AggoqECghz/SfFuUMPOcTBn4RS8JZ2N1e5ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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