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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf72d772a070a6f76ac9fae343829cda50d06b50e91ecab30434f3b64b41005' 
  AND token = 'p7edC1Ra8XHOxh4Z7K2T2mpuEoURoNA6gwzWFIYTfGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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