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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099d8d9d60d24c27522c61c14f5c3f2511f4475f4d87f41f44c299a5f589dd73' 
  AND token = 'Kt9EtoqpHJEj+h3ZH6fFen2T3uvb420MudgerfgZUxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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