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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3e4f7caeab139dc69acc098dfc6971a4e1e99da3e6475831bc0cca365dfd53' 
  AND token = '4Vs867wI20YAPWD2Xh/jVYLR7+PMy4JcjsI/gxOFeE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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