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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833c7bd0c8a60604dfad138ebd5a50f9872842dae7f93286f1df7df2cf7ad49b' 
  AND token = 'yHl8ZyWBhmvmdDRkmTUZWkRgKz5Klphi7kRkXlZZtxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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