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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1585a04e2f8e115eb3be6a3a77ffc6a6f41b467bf4d3e2315551acf55a8c1718' 
  AND token = '8lqBUWIs0ZOkLSAkJSXuxvAIJYg4p/McxCYvb7B3uG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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