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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e38607545b0a89f78454a9d4bad35e5bbda9faea0bcde7d4e1c63e02954ebdd' 
  AND token = 'IuZHgnoMxWL7wIDyWzPgzm6ANjd/5PnNYHTDDd8XMK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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