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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83526389e3947ed311c7a7a8b7ad38d45d7b5aed99145d8f4366d357e9e5add' 
  AND token = 'u05zMDYhDnUwLPiLq0DRDwr+fKldsgq7rO5JPwJiNIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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