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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20153352bad9c7893355a34224239bc5e2386cf677cbff665a6dbe8a89159c5' 
  AND token = '09RzBsQ72FVX8o2/DMipKlOwepMJcWbud9yb7YFmAoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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