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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4fd80b3bc5ae76a1c8610b354adaa0b1e6f498d4695ad11e280ca833a12ec5' 
  AND token = 'jn7am1TdU9S/XTvEvENXNWfztTuOHwTpl8SUf6VYLX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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