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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81939d8bf816a486e71fdb656b9b19cc8c0e5cf80cf09ebd772eee88d494e4a0' 
  AND token = 'aSXrlmE6YOdup89/nRvqLtiuOQdPIdrNBQfqKcTaaRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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