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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95af6b50a2c1ed75f5f49b91a9a383b4cd20d9f364057164f228575a52031bea' 
  AND token = 'XUh/5oLJ06W1boD7i0gU5dEjJ1+Bb/1CRsaCmnUT3nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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