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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d49ddd15b17d6722c48acc20fabddf3ce0c4638dfb2e040e78e8828807cb63' 
  AND token = 'sHRzCyxoZ3RamVc6k7f6a8OqaWD/R9OhR63Rhgb4EUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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