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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ee02992098c021ad24382f0eb052e22a52acf650a3d24af1a802d47d8f4caf' 
  AND token = 'M/WC6DtrSBwog7mAd7MtqjReGZeQqiIHYdvu+2J5DuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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