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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806a0ee9019a44b82c0d7dc52efaecc0814b9466bbd5b9bc5b89df84efcd538f' 
  AND token = 'BTJ/JGB4EowARAHbup2JJDErR0nAsY24Qn/meLIwQgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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